| 摘要 |
PROBLEM TO BE SOLVED: To improve neutral rigidity of a handle by preventing differential pressure of power cylinders from rising in a part near the neutral of the handle. SOLUTION: A power steering device is provided with a first control unit 17 in which variable throttles V1 to V4 are provided on passages respectively connected to a pump and a reservoir 11, and a second control unit 18 connected to the first control unit 17 in parallel and in which variable throttles V5 to V8 are provided in passages respectively connected to both oil chambers of a power cylinder 12 and the reservoir 11, and the variable throttles V5, V6 on the pump side out of respective variable throttles V5 to V8 of the second control unit 18 are constituted of center close valves. |
